Add network diagnostics

[WadeBarnes]

Add MTR (My Traceroute) type diagnostic capabilities into the indy-node-monitor CLI and API. For use when troubleshooting network connectivity to a network or individual nodes.

Features should also include the ability to determine and list the current node configuration for a network based on the current pool transaction information. This would list all of the nodes that are contained in the pool transactions file along with their current status (i.e. IP addresses, and validator status (active/inactive), etc.).